.app{width:100%;height:100vh;display:flex;justify-content:center;align-items:center;padding:20px}.chat-container{width:100%;max-width:800px;height:90vh;background:#fff;border-radius:20px;box-shadow:0 20px 60px #0000004d;display:flex;flex-direction:column;overflow:hidden}.chat-header{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:20px 24px;text-align:center;box-shadow:0 2px 10px #0000001a}.chat-header h1{font-size:24px;font-weight:600;margin-bottom:8px}.user-id{font-size:12px;opacity:.9;font-weight:300}.messages-container{flex:1;overflow-y:auto;padding:20px;background:#f8f9fa;display:flex;flex-direction:column;gap:12px}.messages-container::-webkit-scrollbar{width:8px}.messages-container::-webkit-scrollbar-track{background:#f1f1f1;border-radius:10px}.messages-container::-webkit-scrollbar-thumb{background:#888;border-radius:10px}.messages-container::-webkit-scrollbar-thumb:hover{background:#555}.empty-state{display:flex;justify-content:center;align-items:center;height:100%;color:#666;font-size:16px}.message{display:flex;margin-bottom:12px;animation:fadeIn .3s ease-in}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{justify-content:flex-end}.message.bot{justify-content:flex-start}.message-content{max-width:70%;padding:12px 16px;border-radius:18px;word-wrap:break-word;position:relative}.message.user .message-content{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-bottom-right-radius:4px}.message.bot .message-content{background:#fff;color:#333;border:1px solid #e0e0e0;border-bottom-left-radius:4px;box-shadow:0 2px 4px #0000000d}.message.error .message-content{background:#fee;color:#c33;border-color:#fcc}.message-content p{margin:0;line-height:1.5;white-space:pre-wrap}.message-time{font-size:10px;opacity:.7;display:block;margin-top:4px}.typing-indicator{display:flex;gap:4px;padding:8px 0}.typing-indicator span{width:8px;height:8px;border-radius:50%;background:#999;animation:typing 1.4s infinite}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.7}30%{transform:translateY(-10px);opacity:1}}.input-container{display:flex;padding:16px 20px;background:#fff;border-top:1px solid #e0e0e0;gap:12px}.message-input{flex:1;padding:12px 16px;border:2px solid #e0e0e0;border-radius:24px;font-size:15px;outline:none;transition:border-color .2s}.message-input:focus{border-color:#667eea}.message-input:disabled{background:#f5f5f5;cursor:not-allowed}.send-button{width:48px;height:48px;border:none;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 12px #667eea66}.send-button:hover:not(:disabled){transform:scale(1.05);box-shadow:0 6px 16px #667eea80}.send-button:active:not(:disabled){transform:scale(.95)}.send-button:disabled{opacity:.5;cursor:not-allowed;transform:none}@media (max-width: 768px){.chat-container{height:100vh;border-radius:0}.message-content{max-width:85%}.chat-header h1{font-size:20px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;display:flex;justify-content:center;align-items:center}#root{width:100%;height:100vh;display:flex;justify-content:center;align-items:center}